20. So Moses took his wife and his sons, put them on a donkey, and started back to Egypt. He took with him the walking stick of God.
21. The Lord said to Moses, “When you get back to Egypt, do all the miracles I have given you the power to do. Show them to the king of Egypt. But I will make the king very stubborn, and he will not let the people go.
22. Then say to the king, ‘This is what the Lord says: Israel is my firstborn son.
23. I told you to let my son go so he may worship me. But you refused to let Israel go, so I will kill your firstborn son.’ ”